android上传文件到服务器

向右看齐 2022-08-18 02:58 7阅读 0赞

import java.io.BufferedReader;
    import java.io.DataOutputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.MalformedURLException;
    import java.net.URL;
    import java.util.UUID;
    
    public class UploadThread extends Thread {
        private String fileName;
        private String url;
        public static final String BOUNDARY = "---------------------------61132773524357";
        public static final String PREFIX = "--";
        public static final String END = "\r\n";
        
        public UploadThread(String fileName, String url) {
            super();
            this.fileName = fileName;
            this.url = url;
        }
    
    
    
        @Override
        public void run() {
            // TODO Auto-generated method stub
            DataOutputStream dos = null;
            FileInputStream fis = null;
            BufferedReader br = null;
            try {
                URL httpUrl = new URL(url);
                HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
                conn.setRequestMethod("POST");
                conn.setDoOutput(true);
                conn.setDoInput(true);
                conn.setRequestProperty("Content-Type", "multipart/form-data; boundary="+BOUNDARY);
                dos = new DataOutputStream(conn.getOutputStream());
                dos.writeBytes(PREFIX+BOUNDARY+END);
                String uploadFileName = UUID.randomUUID().toString() + "." + fileName.substring(fileName.lastIndexOf(".")+1);
                dos.writeBytes("Content-Disposition: form-data; name=\"myfile\";"
                        + " filename=\""+uploadFileName+"\"" + END);
                dos.writeBytes(END);
                fis = new FileInputStream(new File(fileName));
                byte[] b = new byte[1024*4];
                int len;
                while((len=fis.read(b)) != -1) {
                    dos.write(b, 0, len);
                }
                dos.writeBytes(END);
                dos.writeBytes(PREFIX+BOUNDARY+PREFIX+END);
                dos.flush();
                
                br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                StringBuffer sb = new StringBuffer();
                String str;
                while((str=br.readLine()) != null) {
                    sb.append(str);
                }
                
                System.out.println("response:" + sb.toString());
                
                
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {
                if (dos != null) {
                    try {
                        dos.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                if (br != null) {
                    try {
                        br.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        }
    
    }

这里使用到的php服务器代码如下：

<?php
    	if(empty($_FILES)) {
    		echo "上传失败";
    		exit();
    	}
    	//判断文件大小是否小于2M，如果大于2M，那么久不上传
    	$file_size=$_FILES['myfile']['size'];
    	if($file_size>2*1024*1024) {
    		echo "文件大小必须 > 2M";
    		exit();
    	}
    	//is_uploaded_file — 判断文件是否是通过 HTTP POST 上传的
    	//如果 filename 所给出的文件是通过 HTTP POST 上传的则返回 TRUE。这可以用来确保恶意的用户无法欺骗脚本去访问本不能访问的文件，例如 /etc/passwd
    	if(is_uploaded_file($_FILES['myfile']['tmp_name'])) {
    		//获取上传的文件
    		$uploaded_file = $_FILES['myfile']['tmp_name'];
    		//定义需要上传到服务器的哪一个位置
    		$move_to_file = $_SERVER['DOCUMENT_ROOT']."/file/".$_FILES['myfile']['name'];
    		//如果成功移动到服务器的具体位置，那么上传成功，否则失败
    		//为了防止上传中出现中文乱码导致上传失败，这里使用了iconv函数
    		if(move_uploaded_file($uploaded_file, iconv("utf-8","gb2312",$move_to_file))) {
    			echo $_FILES['myfile']['tmp_name']."上传成功";
    		} else {
    			echo $_FILES['myfile']['tmp_name']."上传失败";
    		}
    	} else {
    		echo $_FILES['myfile']['tmp_name']."上传失败";
    	}
    ?>